Headphone



FIG. 1 is a front elevational view of the headphone;

FIG. 2 is a rear elevational view of the headphone;

FIG. 3 is a top plan view of the headphone;

FIG. 4 is a bottom plan view of the headphone;

FIG. 5 is a left side elevational view of the headphone;

FIG. 6 is a right side elevational view of the headphone; and,

FIG. 7 is a perspective view of the headphone.

The broken lines form no part of the claimed design. 

We claim the ornamental design for the headphone, as shown and described. 